I usually use small (no more than 2") Bombers but any brand will do as long as it is shad colored. One exception is I like a chartreuse belly with a blue back. These lures need to dive anywhere from 4-8' on 6# line. I personally do not like using a split shot to get the lure deeper. I don't seem to get as many bites although some people swear by it. I plan to try some Yo-Zuri snap beans this year to get a little deeper with a small bait (they are not floaters). A 1/4" Rat-L-Trap lure works well as do the smaller Rapala-type minnow baits. If you want to eliminate small fish, up-size to a regular bass-sized crankbait. You will get fewer crappie bites but they will usually be slabs. I try this after I have already found fish in a given spot. The bigger lure will go a little deeper and give you a different look.

Good luck.

Joe